1. What is a Restriction Orifice Size Calculator?

Definition: This calculator determines the diameter of a restriction orifice needed to achieve a specific flow rate at a given velocity.

Purpose: It helps engineers and technicians design fluid systems by calculating the appropriate orifice size for flow control applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d \) — Orifice diameter (meters, m)
• \( Q \) — Flow rate (cubic meters per second, m³/s)
• \( v \) — Flow velocity (meters per second, m/s)
• \( \pi \) — Pi constant (approximately 3.1416)

Explanation: The formula calculates the diameter of a circular orifice that would allow the specified flow rate at the given velocity.

3. Importance of Orifice Sizing

Details: Proper orifice sizing ensures accurate flow control, prevents system overpressure, and maintains desired process conditions in piping systems.

4. Using the Calculator

Tips: Enter the flow rate in m³/s and desired flow velocity in m/s. All values must be > 0. The result will be the calculated orifice diameter in meters.

5. Frequently Asked Questions (FAQ)

Q1: What is a restriction orifice?
A: A restriction orifice is a device used to limit flow rate or reduce pressure in a piping system by creating a deliberate pressure drop.

Q2: What's a typical flow velocity used for orifice sizing?
A: Common velocities range from 0.5-3 m/s for liquids and 15-30 m/s for gases, depending on application and fluid properties.

Q3: Does this calculation account for pressure drop?
A: No, this is a basic sizing calculation. For detailed design, consider additional factors like discharge coefficient and pressure drop.

Q4: How do I convert the result to millimeters?
A: Multiply the meter result by 1000 (1 m = 1000 mm) for millimeter measurement.

Q5: What if I need to calculate for different units?
A: Convert all inputs to consistent units (m³/s and m/s) before calculation, or adjust the formula for different units.